Journal
RESPIRATORY PHYSIOLOGY & NEUROBIOLOGY
Volume 173, Issue 1, Pages 11-15Publisher
ELSEVIER
DOI: 10.1016/j.resp.2010.05.015
Keywords
Nasal afferents; Fos-like immunoreactivity; Trigeminal complex; TRPV1 agonists; Cough plasticity
Categories
Funding
- VEGA [1/0017/08]
- Centre of clinical and experimental respirology
- EC
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Central neuronal interaction seems to play a role in pathogenesis of upper airway cough syndrome. In the guinea pig model we used the method c-fos expression to identify neurons involved in processing of nociceptive nasal stimuli and their contribution to enhancement of cough. 21 spontaneously breathing, urethane anaesthetized animals were used. The controls received intranasal saline, stimulation group received capsaicin (15 mu l, 50 mu M), and not-treated group was free of nasal challenge. After 2 h animals were deeply anaesthetized, exsanguinated and transcardially perfused with saline and paraformaldehyde. The brainstems were removed, post-fixed, and slices were processed immunohistochemically for c-fos. In capsaicin group the FLI was detected in the nTs 0.5 mm caudal, 1.5 mm lateral to the obex, the area postrema, LRN and VRG. Intensive FLI was identified in trigeminal nuclear complex. Mean number of FOS positive neurons per section was significantly higher in capsaicin group than that in no-treatment controls or saline controls at the level of obex (p<0.01). Neurons of nTs and VRG clearly activated after nasal provocation may participate in enhancement of cough. (C) 2010 Elsevier B.V. All rights reserved.
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